Xiaomi WiFi Calling Missing on O2? UK Solution

Quick Answer

If WiFi Calling is missing on your Xiaomi with O2 UK, contact O2 on 202 and ask them to enable VoWiFi on your account. Restart your phone and check Settings → SIM cards & mobile networks → O2 SIM → WiFi Calling toggle.

How to Enable O2 WiFi Calling on Xiaomi – First Step

Based on user reports across O2 UK community forums, most Xiaomi users miss WiFi Calling because O2 hasn't enabled it on their account.

Call O2 UK: 202 (free from O2 SIM) or 0344 809 0202 (8am–8pm daily)

Request specifically:

  • "Enable WiFi Calling (VoWiFi) on my account"
  • Provide your IMEI number (dial *#06# on Xiaomi)
  • Ask them to confirm the feature is active on their side

User reports on O2 community forum indicate provisioning takes from a few hours up to a day. After they confirm, restart your Xiaomi and wait a few hours before checking the toggle.

Models That Commonly Work with O2 WiFi Calling

Based on O2 community discussions and user reports, these models are widely reported to work with O2 WiFi Calling:

Series Commonly Reported Working Models
Xiaomi Series Xiaomi 14, Xiaomi 14 Pro, Xiaomi 15
Redmi Note Series Redmi Note 13 Pro 5G, Redmi Note 13, Redmi Note 12 Pro 5G
POCO Series POCO F6, POCO X6 Pro, POCO F5
Limited or No Support Redmi Note 10 or older, POCO X3, Mi 9 series

Important: If your model is not on the list above, O2 may still enable WiFi Calling – but user reports indicate inconsistent behaviour. The toggle may appear but fail to register calls over WiFi.

Where to Find WiFi Calling Toggle on HyperOS (O2 UK)

After O2 enables provisioning, navigate exactly:

Settings → SIM cards & mobile networks → Select O2 SIM → WiFi Calling (toggle ON)

Alternative path (HyperOS 2.0 and 2.1):

Settings → Connections → Mobile networks → O2 → WiFi Calling

If the toggle is greyed out but visible: O2 provisioning is active but network registration failed. Toggle Airplane mode ON for 30 seconds, then OFF.

If the toggle is completely missing: O2 may not have provisioned your account yet, or your Xiaomi model may be unsupported.

HyperOS Mobile Network Preference – Hidden Setting

HyperOS sometimes prefers mobile network over WiFi Calling even when the toggle is ON. Multiple users on Xiaomi Community forums report this as a common issue on O2 UK, especially in older London flats where WiFi signal fluctuates.

Fix: Settings → SIM cards & mobile networks → O2 SIM → Mobile network preference → Select WiFi preferred (not "Mobile network preferred")

Users report this setting resets after HyperOS updates. Check it after every major update.

WiFi Calling Not Working After Enable – O2 Specific Fixes

If WiFi Calling toggle is ON but calls still route over O2 4G:

  1. Check WiFi speed: O2 requires a stable connection. Test on speedtest.net. Slow or unstable WiFi may prevent VoWiFi activation.
  2. Disable mobile data during call test: Turn OFF mobile data completely. Make a call. If call connects, WiFi Calling is active. If fails, VoWiFi may not be registered.
  3. Check O2 WiFi Calling status code: Dial *#*#4636#*#* → Phone information → Look for "VoWiFi status". If shows "DISABLED", O2 provisioning may have failed.
  4. Forget and reconnect to WiFi: Settings → WiFi → Tap your network → Forget → Reconnect with password. This forces HyperOS to renegotiate VoWiFi.

O2 WiFi Calling Missing After HyperOS Update – Known Bug

User reports across Xiaomi Community (UK section) indicate HyperOS 1.0 → 2.0 update can hide WiFi Calling toggle on:

  • Redmi Note 13 Pro 5G
  • POCO X6 Pro
  • Xiaomi 14 (rare cases)

Fix sequence reported by users:

  1. Check APN settings: O2 APN should be mobile.o2.co.uk. If changed, revert to default.
  2. Reset network settings: Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth
  3. Restart device
  4. Wait an hour – O2 network may re-provision automatically on some devices
  5. If still missing, call O2 202 and request "VoWiFi refresh"

How to Force WiFi Calling on Xiaomi with O2 (Indoor Coverage Fix)

In older UK flats with weak O2 indoor signal, standard WiFi Calling sometimes fails to activate even when the toggle is ON.

Fix reported by multiple UK users on O2 community forums: Enable Airplane mode → Turn ON WiFi only → Make call. This forces VoWiFi because mobile network is disabled. Users report this works consistently on Redmi Note 13 Pro 5G and POCO F6.

If Airplane mode trick works but normal mode doesn't, the issue is O2's network prioritisation, not your Xiaomi.

O2 WiFi Calling Abroad – What Users Report

O2 UK allows WiFi Calling from abroad according to their support pages, but with restrictions:

  • You can only call UK numbers over WiFi Calling while roaming
  • Calls to local country numbers route over mobile network, not WiFi
  • On Xiaomi, HyperOS may restrict VoWiFi when roaming detection is active

Fix for abroad use (reported by O2 community members): Enable Airplane mode → Turn ON WiFi → Connect to local WiFi → Make call to UK number. This forces VoWiFi.

SIM / Network Reset Actions for O2 WiFi Calling

If O2 confirms provisioning but toggle still missing, perform in this order:

  1. Airplane mode – ON for 60 seconds (longer than usual), then OFF
  2. Restart device – full restart, wait 2 minutes after boot
  3. Reinsert SIM – power off, remove O2 SIM, clean contacts, reinsert firmly
  4. Switch SIM slot – on dual SIM models (POCO F6, Redmi Note 13), move O2 SIM to other slot

Contact O2 UK – Escalation Path

If standard support (call 202) cannot enable WiFi Calling:

  • O2 Technical Support: 0800 902 0217 (9am–6pm Mon-Fri)
  • O2 Community Forum: community.o2.co.uk – Search "Xiaomi WiFi Calling" for model-specific threads

According to user reports, O2's technical team can sometimes enable VoWiFi on non-standard Xiaomi models if you escalate past first-line support. Several users on O2 community forums have reported success after follow-up calls.

Frequently Asked Questions

Why is WiFi Calling not showing on my Xiaomi with O2?

O2 UK requires carrier provisioning. Call 202 to enable VoWiFi on your account. After activation, wait a few hours and restart your phone. The toggle appears under Settings → SIM cards & mobile networks → O2 SIM.

Does O2 support WiFi Calling on all Xiaomi models?

Not all models. O2 users commonly report successful WiFi Calling on Xiaomi 14 series, Redmi Note 13 series, and POCO F6. Older models like Redmi Note 10 or POCO X3 may never show the toggle even after provisioning.

How to enable WiFi Calling on Xiaomi with O2 after update?

Settings → SIM cards & mobile networks → O2 SIM → WiFi Calling toggle. If missing, call O2 on 202 to confirm VoWiFi is still enabled. HyperOS updates sometimes reset carrier configuration. Re-provisioning may take a few hours.

Why does WiFi Calling turn off automatically on O2?

O2 requires a stable internet connection. In older London flats with thick walls, HyperOS may disable VoWiFi when signal fluctuates. Check your broadband stability. Use Airplane mode trick to force VoWiFi.

Can I use WiFi Calling abroad with O2 on Xiaomi?

Yes, but only to UK numbers. Enable Airplane mode, turn ON WiFi only, then call UK numbers. Local calls to your roaming country still use mobile network. O2 community members have confirmed this works on Xiaomi 14.

Related Guides

Final Verdict

Start with O2 provisioning – user reports indicate this is the most common cause of missing WiFi Calling on Xiaomi. Call 202 and request VoWiFi activation. After confirmation, wait a few hours and restart. If toggle appears but calls fail, use Airplane mode trick (WiFi only) to force VoWiFi. For unsupported older models, escalate to O2 Technical Support. HyperOS updates rarely break VoWiFi permanently – network reset usually recovers it within an hour.

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